Alert archive / Iowa / Tornado Warnings in 2002

Tornado Warning 3, NWS Quad Cities, IA

April 18, 2002Iowa County, Iowa

NWS Quad Cities, IA issued this tornado warning at Apr 18, 2002, 8:27 PM CDT for Iowa County, Iowa. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 18, 2002, 8:27 PM CDT (01:27 UTC)
Expired: Apr 18, 2002, 9:15 PM CDT
In force: 48 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County Iowa County, IA

The radar

The Quad Cities radar (KDVN), 127 km from the middle of the area, began a volume at 01:28 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.5 hours before the alert went out and 134 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1636 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 1702 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WFUS53 KDVN 190127
TORMLI
IAC095-190215-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
827 PM CDT THU APR 18 2002

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  IOWA COUNTY IN EAST CENTRAL IOWA

* UNTIL 915 PM CDT

* AT 823 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH A POSSIBLE TORNADO 8 MILES SOUTHWEST OF
  LADORA...OR 7 MILES EAST OF BROOKLYN...MOVING EAST AT 40 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
   LAKE IOWA BY 830 PM CDT.
   GENOA BLUFF BY 835 PM CDT.
   WILLIAMSBURG BY 845 PM CDT.
  6 MILES NORTH OF HOLBROOK BY 850 PM CDT.

NIGHTTIME TORNADOES ARE ESPECIALLY DANGEROUS BECAUSE THEY ARE 
DIFFICULT TO SEE. TAKE COVER NOW  BE PREPARED FOR LARGE HAIL AND 
DAMAGING WIND.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM CDT FRIDAY
MORNING FOR EASTERN IOWA AND NORTHWEST ILLINOIS AND NORTHEAST
MISSOURI.

LAT...LON 4185 9227 4154 9228 4153 9184 4185 9185

WOLF

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 18, 7:51 PM CDT	Severe Thunderstorm Warning	DVN	Benton	34 min
Apr 18, 7:55 PM CDT	Tornado Warning	DVN	Benton	35 min
Apr 18, 8:09 PM CDT	Tornado Warning	DVN	Buchanan	36 min
Apr 18, 8:17 PM CDT	Severe Thunderstorm Warning	DVN	Linn	33 min
Apr 18, 8:35 PM CDT	Tornado Warning	DVN	Jones, Linn	35 min
Apr 18, 8:44 PM CDT	Severe Thunderstorm Warning	DVN	Dubuque	31 min
Apr 18, 8:59 PM CDT	Tornado Warning	DVN	Johnson	46 min
Apr 18, 9:16 PM CDT	Severe Thunderstorm Warning	DVN	Jackson	44 min
Apr 18, 9:28 PM CDT	Tornado Warning	DVN	Cedar	32 min
Apr 18, 9:30 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Jones	45 min
Apr 18, 9:50 PM CDT	Severe Thunderstorm Warning	DVN	Scott	40 min
Apr 18, 9:59 PM CDT	Severe Thunderstorm Warning	DVN	Jackson	51 min

Nearby

Tornado Warnings in Iowa, 2002 Every tornado warning in 2002 Tornadoes in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.